Evaluation of IMERG precipitation product in the investigation of drought events in the Kermanshah Province

IF 2.3 4区 地球科学
Morteza Gheysouri, Ataollah Kavian, Mahin Kalehhouei, María Fernández-Raga, Jesus Rodrigo-Comino
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Abstract

Our world is facing new challenges due to the prolonged drought events that have occurred over the past decade. These events are affecting ecosystem services and Earth surface processes adding unpredictable responses to be managed. In this study, a comprehensive evaluation of integrated multi-satellite retrieval (IMERG) global precipitation measurement products was conducted to determine the drought situation in semi-arid and arid areas. Predicted precipitation values from the final IMERG from 2001 to 2020 were used to evaluate 3, 6, and 12 months of drought in 13 meteorological stations in the Kermanshah Province, a representative study area. The results showed that IMERG has a relatively good performance in detecting the spatial patterns of heavy and low precipitation, so that in the northern stations, where the rainfall amount is higher, IMERG has shown good performance. The drought results obtained from IMERG show that the SPI-3 index is close to the station data; therefore, the average of RMSE, R2, and ENS of the 3 month time step data is equal to 0.7, 0.5, and 0.6 compared to SPI-6 and 12 data. The results of drought frequency showed that drought intensity in the Kermanshah Province was higher than that in SPI-3 at 12 and 6 months, whereas the 3 month drought frequency closely matched that of the station data. In examining the time step of the drought event, it was found that the IMERG data showed the drought 1–2 years earlier than the station data, which can be used to evaluate early droughts. In this case, we demonstrated that the SPI-3 drought index obtained from IMERG data was the best indicator of drought. The overall findings indicate that IMERG data are able to simulate droughts earlier than station data and can be a useful tool for drought monitoring and disaster management in semi-arid and arid regions. This research can be applied in the use of satellite precipitation products for regional drought management.

克尔曼沙赫省干旱事件调查中IMERG降水产品的评价
由于过去十年来发生的长期干旱事件,我们的世界正面临新的挑战。这些事件正在影响生态系统服务和地球表面过程,增加了需要管理的不可预测的响应。本研究对综合多卫星检索(IMERG)全球降水测量产品进行了综合评价,以确定半干旱和干旱地区的干旱状况。利用2001 - 2020年IMERG最终预测值对代表性研究区Kermanshah省13个气象站的3、6和12个月的干旱进行了评价。结果表明,IMERG在强降水和低降水的空间格局检测上具有较好的性能,在降雨量较大的北站表现出较好的性能。IMERG干旱观测结果表明,SPI-3指数与台站数据较为接近;因此,3个月时间步长数据的RMSE、R2和ENS的平均值分别为0.7、0.5和0.6,与SPI-6和12数据相比。干旱频率结果表明,克尔曼沙阿省12个月和6个月的干旱强度高于SPI-3,而3个月的干旱频率与台站数据基本吻合。对干旱事件的时间步长进行检验,发现IMERG数据比台站数据早1 ~ 2年出现干旱,可以用来评价早期干旱。在这种情况下,我们证明了从IMERG数据中获得的SPI-3干旱指数是干旱的最佳指标。总体结果表明,IMERG数据能够比台站数据更早地模拟干旱,可以成为半干旱和干旱地区干旱监测和灾害管理的有用工具。本研究可应用于卫星降水产品在区域干旱管理中的应用。
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来源期刊
Acta Geophysica
Acta Geophysica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
3.80
自引率
13.00%
发文量
251
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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